Subtitle
Supplemental Instruction
Iowa State University / Leader: / Ross Westercamp
Course: / Physics 111
Instructor: / Dr. John Hill
Date: / September 13, 2011
- Two crates, one with mass 4.0 kg and the other with mass 6.0 kg, sit on the frictionless surface of a frozen pond, connected by a rope. A woman pulls horizontally on the 6.0 kg crate with a force F that gives the crate an acceleration of 2.50 m/s2.
- What is the acceleration of the 4.0 kg crate?
- What is the tension T in the rope that connects the two crates?
- An oil tanker’s engines have broken down, and the wind is blowing the tanker straight toward a reef at a constant speed of 1.5 m/s. When the tanker is 500 m from the reef, the wind dies down. The rudder is stuck so the only choice is to try to accelerate straight backwards away from the reef. The mass of the tanker is 3.6x10^7 kg, and the engines produce a horizontal force of 8.0 x10^4 N. Will the ship hit the reef?
- At the surface of Jupiter’s moon Io, the acceleration due to gravity is g = 1.81 m/s2. A watermelon weighs 44.0 N at the surface of earth’s surface.
- What is the watermelon’s mass on the earth’s surface?
- What are its mass and weight on Io?
- To give a 19 kg child a ride, two teenagers pull on a 3.7 kg sled with ropes. Both pull with a force of 55 N at an angle of 35 degrees relative to forward motion. In addition, the snow exerts a retarding force on the sled that points opposite to the direction of motion, with magnitude 57 N. Find the accleration of the sled and child.